Configure SQL linter casing depending on keyword

Question

Is it possible to configure SQLFluff to make some keywords upper case and other lower case?

• upper case: SELECT, FROM, JOIN
• lower case: as, on, case, when, else, end

The following snippet should be an example result.

SELECT
    a,
    case when b >= 42 then 1 else 0 end as c
FROM some_table as S
JOIN another_table as T
    on a is not null
        and b > 0